I've never participated in a prerelease tournamnet before but this Saturday I've decided to join. All I know is that each person builds a 40-card deck from the 6 booster packs given in the tournament. I have no idea how to build a good deck out of the 54 cards. From the new dragon set, most of them are pokemon, and very few trainer cards. What's the chance of picking the right booster with the right basic and evolved pokemon cards? I'm stuck. I need tips and help.